The influence of hydrocyclone diameter on reduced-efficiency curves     

A.J. Lynch  T.C. Rao  K.A. Prisbrey 《International Journal of Mineral Processing》1974,1(2):173-181

Classification tests have been carried out on limestone in 10.2-, 15.2-, 25.4- and 38.1-cm “Krebs” hydrocyclones in order to study the effect of cyclone diameter on the reduced-efficiency curve. Parameters which were varied included the vortex finder and spigot diameter, throughput and feed-solids content, but the feed size remained constant. The reduced-efficiency curve was found to be constant for all tests and the conclusion is that for constant feed size this curve is a function of the material being classified only for geometrically similar cyclones and is independent of the cyclone diameter.  相似文献   

Note on Parasnis' method for surface rock densities     

V. Bhaskar Rao  B. V. Satyanarayana Murty 《Pure and Applied Geophysics》1973,110(1):1927-1931

Summary Assuming a zero regional, Parasnis presented a linear relationship between the relative gravity and the average surface rock density. If a certain amount of regional variation in the relative gravity exists this method cannot be relied upon. In the present article an extension of Parasnis' method is suggested for the case when linear regional exists. A field example from the Godavari Valley is described.  相似文献   

Break in the Indian summer monsoon     

R. Ramanadham  P. Visweswara Rao  J. K. Patnaik 《Pure and Applied Geophysics》1973,104(1):635-647

Summary The changes in circulation patterns over Eurasia during break monsoon condition over India are studied in comparison to the active monsoon condition. Break monsoon condition seems to set in over the India Sub-Continent in association with eastward movement of middle latitude westerly trough at 500 mb, having large amplitude extending into west Pakistan and northern India. Simultaneously the subtropical anticyclonic ridge over Arabia protrudes into central and Peninsular India. The high latitude blocking high over East Siberia retrogrades and the East Asiatic trough deepens and moves eastwards. The west Pacific subtropical ridge recedes eastward from the China continent. During this period the monsoon trough shifts, from its normal position over Gangetic plains, northwards to the foot of the Himalayas and the monsoon westerlies in the lower troposphere extends right upto the rim of the Tibetan Plateau. The sub-tropical ridge line in the upper troposphere shifts northwards during break and lies approximately above the lower monsoon trough. This seems to provide an effective process of removing ascending air in the lower monsoon trough causing exceptionally heavy rainfall over Assam and along the foot of the Himalayas.  相似文献   

Unsteady Drawdown at a Partially Penetrating Well in a Transversely Isotropic Artesian Aquifer     

D. Babu Rao  Gabor M. Karadi  Raymond J. Krizek 《Ground water》1973,11(6):44-49

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Comparison of radioactive glasses of scandium and iridium as tracers in sediment-transport studies     

K. Krishnamurthy  S.M. Rao 《Journal of Hydrology》1973,19(3):189-204

This paper attempts to make a systematic comparison of all important criteria for the selection of either scandium-46 or iridium-192 as the radioisotopic glass tracer for bed-load transport studies in rivers and estuaries. This study has been restricted to only these two tracers as they are found to be the only strong contenders for long-range quantitative studies.The discussion leads the authors to the conclusion that except for the transport problem, scandium-46 is preferable to iridium-192 in all other respects.  相似文献   

Magnetic study of metabasic rocks of Gomoh (India)     

Jagdeo Singh  M. Krishna Rao 《Pure and Applied Geophysics》1972,98(1):127-138

Summary A magnetic study of metabasic dykes of pre-Cambrian age in Gomoh has been done. 9 magnetic profiles have been taken with Schmidt vertical force variometer. Direction and intensity of NRM have been determined for 25 oriented samples with an astatic magnetometer. Magnetic susceptibility of the samples has been determined. The magnetic profiles have been interpreted by considering both natural remanence and susceptibility of the rock samples. The remanent magnetic directions have two groups, one corresponding to the northern hemisphere and the other to the southern hemisphere. The corresponding latitudes of the place would then be 34°N and 42°S. It is suggested here that metamorphism of the basic rocks of this area took place during two distinct geologic epochs, one when India was in northern hemisphere and the other when in southern hemisphere, presuming that continental drift has taken place.  相似文献   

Transmission of elastic pulses in bars     

Y. V. Ramana  M. V. M. Satyanarayana Rao 《Pure and Applied Geophysics》1969,76(1):110-122

Summary The transmission of elastic pulses through solid bars has been investigated experimentally with particular reference to the shape of the bars. A single input pulse giving rise to a series of pulses at the receiver which help in the computation of dilatational and rotational velocities in the material has been exploited for the experimental work, and it has been found that the method is applicable to cylindrical and cubical (square) bars in an equal manner. Results of the experimental investigations carried out in cylindrical and square bars of brass are compared and found to be in good agreement. Also results in square bars of Aluminium, Steel, and a few rock samples are reported. The rock samples studied include limestone, sandstone and a crypto-crystalline rock. An attempt to study the applicability of this method to rectangular bars has also been made and the results obtained are consistent and in agreement with the results due to cylindrical and square bars.N.G.R.I.-68-117.  相似文献   

The tropopause over India     

R. Ramanadham  I. Subbaramayya  N. Jaganmohana Rao  J. K. Patnaik 《Pure and Applied Geophysics》1969,75(1):355-364

Summary The frequency of occurrence of the polar and tropical tropopause at different stations in India in different months is studied. The seasonal and latitudinal height variations of the tropical tropopause are examined. A break in the tropical tropopause just at the latitude of the easterly jet stream is suggested. The lower southern tropopause is called the monsoon tropopause. A few comments on the possible characteristics of the monsoon tropopause are given.  相似文献   

Remanent magnetism of dykes and continental drift     

B. S. R. Rao  I. V. Radhakrishna Murthy 《Pure and Applied Geophysics》1967,68(1):124-130

Summary The possibility of utilising the results of remaeent magnetism of sub-surface bodies, as obtained from the magnetic surveys, for the study of continental drift is presented. As an example, the quartz-magnetite bands occurring at Ongole, Andhra Pradesh, India have been magnetically surveyed. A modified method for the interpretation of magnetic anomalies of infinite dykes has been presented and is used for the interpretation of field profiles. A remanent magnetic vector with an up dip of 26° lying exactly in the present magnetic meridian has been obtained, which yields the ancient latitude of India (Reference Town being Nagpur) to be 9°S of equator at an age of 1400 million years.  相似文献   

Some remarks concerning residuals and derivatives     

B. Sundara Rama Rao  I. V. Radhakrishnamurthy 《Pure and Applied Geophysics》1965,61(1):5-16

Summary An analysis of the existing second derivative systems has been attempted and the superiority ofPeters' method overElkins' is brought out. Some properties of vertical derivatives have been discussed and it is clearly proved that the derivative values are independent of the regional. Finally, the weak and strong points of grid and least square methods have been assessed. Some interesting applications of the least square methods are also described.  相似文献